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Table 3 Clinimetric properties of the DEMMI

From: The de Morton Mobility Index (DEMMI): An essential health index for an ageing world

Clinimetric property Development study 17 items Validation study 15 items
Reliability, MDC 90 (95%CI)   
   Inter rater 9.5 (5.0 to 13.3), n = 21 8.90 (6.3 to 12.7), n = 35
MCID (95%CI)   
   Criterion based method 7.8 (5.3 to 10.2) 9.43 (5.9 to 12.9)
   Distribution based method 8.0 10.5
Construct Validity (r, 95%CI)   
Convergent   
   HABAM 0.92 (0.88 to 0.95), p = 0.00 0.91 (0.87 to 0.94), p = 0.00
   Barthel Index 0.76 (0.65 to 0.84), p = 0.00 0.68 (0.56 to 0.77), p = 0.00
Discriminant   
   MMSE 0.36 (0.16 to 0.53), p = 0.00 0.24 (0.05 to 0.41), p = 0.02
   APACHE 11 -0.11 (-0.32 to 0.11), p = 0.18 0.07 (-0.12 to 0.26), p = 0.49
   Charlson -0.19 (-0.39 to 0.03), p = 0.11 -0.04 (-0.23 to 0.15), p = 0.68
Known Groups (DEMMI, 95%CI)   
   discharge to rehabilitation 37.54 (33.99 to 45.10), n = 11 50.75 (42.39 to 59.11)n = 8
   discharge to home 59.61 (56.32 to 62.90), n = 62
Independent t test: p = 0.00
62.14 (57.80 to 66.49) n = 70
Independent t test: p = 0.03
Responsiveness to change #   
Effect Size Index #   
   DEMMI 0.37 (0.28 to 0.46) 0.39 (0.28 to 0.50)*
   HABAM 0.31 (0.20 to 0.43) 0.35 (0.23 to 0.47)
   Barthel Index 0.30 (0.17 to 0.44) 0.13 (0.01 to 0.25)*
GRI (patient) #   
   DEMMI 1.23 (0.90 to 1.56) 0.92 (0.66 to 1.17)*
   HABAM 1.00 (0.46 to 1.55) 0.72 (0.49 to 0.94)
   Barthel Index 0.48 (0.01 to 0.95) 0.43 (0.21 to 0.65)*
GRI (therapist) #   
   DEMMI 2.06 (1.60 to 2.51) 1.73 (1.37 to 2.09)*
   HABAM 2.62 (1.70 to 3.54) 1.17 (0.86 to 1.48)
   Barthel Index 1.58 (0.56 to 2.60) 0.65 (0.37 to 0.93)*
Floor effect 0% <1%
Ceiling effect <1% 3.8%
Time to administer, mean (sd) 13 mins 42 seconds (4.99 mins) for 42 mobility items 8 mins 47 seconds (3.89 minutes) for 17 mobility items
  1. GRI = Guyatt's Responsiveness Index, # Tryon's inferential confidence intervals
  2. * significant difference: evidenced by non overlapping inferential confidence intervals